Back brace



FIG. 1 is a perspective view of a back brace showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a side view thereof; and,

FIG. 5 is a back view thereof.

The broken lines showing protruding back elements and back laces illustrate portions of the back brace which form no part of the claimed design. 

CLAIM The ornamental design for a back brace, as shown and described. 